step1. in msaccess, select the complete empty last row
step2. goto excel, select and copy new records ( the no. of cols must be the same or less, as that of in ur msaccess table)
step3, go back to msaccess and paste,
all records will be copied.
the above is manual copy and paste,
other way around is to use import/export feature wherein you mention the file you would like to import in a given selected table, and the records are appended in the table
for this you may refer to the website >>>
http://support.microsoft.com/kb/141228